It goes in streaks. Some days I'm online for 2 or 3 hours (lurking, mostly), while some days I don't even log in.
I'm sure my AG "laytime" was significantly higher a few years ago. Now this place is approaching ghost town status and there isn't really anything to do here, besides lurk in the shadows.
Anywhere from 20-90 minutes on a week day. On the weekend then it's usually anywhere up to 2 hours. So not too much but enough to get around. My parents say I am on too much though (But I don't do anything or have anything to do other than this)